7 research outputs found

    Group B Streptococcus

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    RelaĆ§Ć£o entre qualidade e liberaĆ§Ć£o de N por plantas do semiĆ”rido usadas como adubo verde Relationship between biomass quality and N mineralization in plant species used as green manure in semi-arid Brazil

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    O uso de plantas como adubo verde pode ser uma alternativa para melhorar a fertilidade do solo porĆ©m a liberaĆ§Ć£o de nutrientes desses adubos para o solo irĆ” depender dos teores de lignina, polifenĆ³is (PP) e N no material vegetal utilizado. Tais teores foram determinados em 24 espĆ©cies vegetais encontradas em propriedades rurais do semiĆ”rido e relacionados com a mineralizaĆ§Ć£o de N, quando incorporados ao solo. Os materiais apresentaram grande variaĆ§Ć£o nos teores os quais, por sua vez, sinalizaram baixa correlaĆ§Ć£o com as proporƧƵes do N mineralizado depois da incorporaĆ§Ć£o. Utilizando os teores e suas relaƧƵes, realizou-se anĆ”lise de componentes principais agrupando os materiais de acordo com suas similaridades, visando verificar a existĆŖncia de relaƧƵes entre a formaĆ§Ć£o dos grupos referidos e o N mineralizado apĆ³s incubaĆ§Ć£o dos materiais orgĆ¢nicos. Quatro grupos foram formados; no entanto, pouca informaĆ§Ć£o Ćŗtil foi gerada no sentido de tentar predizer a mineralizaĆ§Ć£o de N com base na qualidade dos materiais testados. O comportamento da lignina nĆ£o foi bem definido na formaĆ§Ć£o dos grupos e nĆ£o apresentou relaĆ§Ć£o clara com a mineralizaĆ§Ć£o do N devido, talvez, ao curto prazo de avaliaĆ§Ć£o da metodologia adotada (28 dias). Todos os materiais que apresentaram relaĆ§Ć£o PP/N menor que 0,5, mineralizaram N enquanto que os apresentaram a mesma relaĆ§Ć£o acima de 5, imobilizaram N.<br>The use of plants as green manure may be an alternative to improve soil fertility in the region, but the release of nutrients to the soil will depend on the concentrations of lignin, polyphenols (PP), and nitrogen of the green manures used. These variables were analyzed for 24 plant species commonly found in farms of the semi-arid region of NE Brazil, and the relationship between plant biomass quality and N release after incorporation into the soil was evaluated. There was a large variation in the concentration of lignin, PP and N of the green manures tested but these variables presented a low correlation with N mineralization after incorporation to the soil. In order to try to identify patterns among the different manures regarding quality and N release, these were grouped using Principal Component Analysis techniques, but very little meaningful patterns were observed to help predict N release based on the quality of the materials. The lignin content of the materials played an important role to form different groups, but may be the short time of the incubations (28 days) did not allow for the development of the correlation between lignin content and N release. In general, it was observed that all materials that presented a PP/N ratio lower than 0.5 mineralized N, while those that presented values of this ratio above 5 caused N immobilization

    Science in agroforestry

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